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    <script>
      // 题目2(必做)：现在两个数组，判断在a中的元素，不在b中
      // const a = [1,2,3,5] const b=[1,3,5,6] 将在a不在b中的筛选出来
      // 要求：输出一个数组：[2]
      const a = [1, 2, 3, 5]
      const b = [1, 3, 5, 6]
      const arr = []
      for (let i = 0; i < a.length; i++) {
        if(!b.some((item) => item === a[i])){
          arr.push(a[i])
        }
      }
      console.log(arr);
    </script>
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